Kerberos’ massive body crumpled to the ground with a low rumble.
Clan Calatin stared wide-eyed. Hansa Cervantes, watching from a window of the church, scowled and murmured:
“...It doesn’t seem like a genuine demon. A temporary existence as a phantasmal species...? Still, to become something that fiendish, even temporarily...”
Hansa pressed a hand to his eye patch and muttered to himself about the thing Flat’s Heroic Spirit had become — that is, about the entity that most ordinary people would call a “demon.”
“If I didn’t know it was a Heroic Spirit... I’d be calling on the Burial Agency right about now.”

Fate/Strange Fake: Volume 4, Chapter 13 ("Day 2, Night")